@article{10_1017_S0017089500001920,
     author = {Singh, B. M.},
     title = {On triple trigonometrical equations},
     journal = {Glasgow mathematical journal},
     pages = {174--178},
     year = {1973},
     volume = {14},
     number = {2},
     doi = {10.1017/S0017089500001920},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001920/}
}